The Weaver Grandslam Scope Base, S45 (brand part no. 48226) is a precision-built, all-steel scope base machined to tight tolerances for a custom fit rather than a generic universal mount. Weaver engineers a square-cut notch into every Grandslam base to mate with the sturdy cross bolt found in Weaver Detachable rings, giving you a dependable lockup once your rings and scope are installed. Custom hardened fastening screws ship with the base, and it is built for bolt-action rifles, fitting a range of vintage and classic platforms including Mauser-pattern actions, the Marlin 455, Parker-Hale models, and several Interarms, Musgrave, Sears, and Voere rifles built on similar receivers.

Key Specifications

• Machined from all steel for a durable, precision-built base.
• Held to tight tolerances for a custom, non-generic fit.
• Uses a square-cut notch that mates to the cross bolt in Weaver Detachable rings.
• Ships with custom hardened fastening screws.
• Built for bolt-action rifles on Mauser-pattern and similar vintage receivers, including the Marlin 455 and Parker-Hale models.
• Weighs approximately 1.1 oz, keeping it lightweight for easy carry.
• Built for Bolt Action platforms.
• Built in the Weaver-Style Bases style.

Frequently Asked Questions

What rings does this base work with? Weaver Detachable rings, which lock to the base’s square-cut, cross-bolt notch.

Does it include mounting screws? Yes, custom hardened fastening screws are included.

Buy the Weaver Grandslam Scope Base, S45

Vintage bolt-action rifles deserve a base built to their exact receiver rather than a generic drill-and-hope fit, and this all-steel Weaver Grandslam base delivers that precision along with a secure Weaver Detachable ring lockup. Shop more Weaver gear or browse our scope accessories selection, and order it from our Lubbock, Texas gun shop for fast, direct-to-you shipping.